TI,TI公司,TI代理商
TI(德州仪器)| TI产品型号搜索
专营TI元器件,强大的现货交付能力,解决您的采购难题
全流程提供TI现货供应链服务
当前位置:TI公司 > > TI芯片 >> LM49450
LM49450技术文档下载:
LM49450技术文档产品手册下载
LM49450 - 产品图解:
LM49450-具有接地参考耳机放大器、3D 增强功能和耳机感应的 I2C 输入 2.5W/通道低 EMI 立体声 D 类子系统
承诺原装正品
专营TI,真正优化您的供应链
TI产品 - LM49450介绍
LM49450 - 具有接地参考耳机放大器、3D 增强功能和耳机感应的 I2C 输入 2.5W/通道低 EMI 立体声 D 类子系统

LM49450是TI公司的一款音频DAC产品,LM49450是具有接地参考耳机放大器、3D 增强功能和耳机感应的 I2C 输入 2.5W/通道低 EMI 立体声 D 类子系统,本页介绍了LM49450的产品说明、应用、特性等,并给出了与LM49450相关的TI元器件型号供参考。

LM49450 - 具有接地参考耳机放大器、3D 增强功能和耳机感应的 I2C 输入 2.5W/通道低 EMI 立体声 D 类子系统 - 音频DAC - 音频转换器 - TI公司(Texas Instruments,德州仪器)

产品描述

The LM49450 is a fully integrated audio subsystem designed for portable media player applications. The LM49450 combines a 24-bit I2S digital-to-analog converter (DAC), 2.5W/channel stereo Class D speaker drivers, 36mW stereo ground referenced headphone drivers, volume control, and TI’s unique 3D sound enhancement into a single device.

The filterless Class D amplifiers deliver 1.25W/channel into an 8? load with <1% THD+N with a 5V supply. The LM49450 offers two logic selectable modulation schemes, fixed frequency mode, and an EMI reducing spread spectrum mode. The 36mW/channel headphone drivers feature TI’s ground referenced architecture that creates a ground-referenced output from a single supply, eliminating the need for bulky and expensive DC-blocking capacitors, saving space and minimizing system cost. A headphone sense input (HPS) automatically detects the presence of a headphone, and configures the device accordingly.

The LM49450 stereo, 24-bit DAC supports a wide range of sample rates (including 192kHz, 96kHz, 48kHz, and 44.1kHz). The digital audio signal path features better than 100dB SNR, and low 0.05% THD+N when measured at the headphone outputs. The flexible 3-wire I2S interface supports left or right justified audio data.

The LM49450 features separate 32-step volume control for the headphones and speaker outputs. 3D enhancement, mode selection, shutdown control, and volume are controlled through an I2C compatible interface.

Output short circuit and thermal overload protection prevent the device from being damaged during fault conditions. Superior click and pop suppression eliminates audible transients on power-up/down and during shutdown. The LM49450 is available in a space saving 32-pin WQFN package.

产品特性

  • 24–Bit Stereo DAC
  • Stereo Filterless Class D Operation
  • Selectable Spread Spectrum Mode Reduces EMI
  • Ground Referenced Headphone Amplifiers with 100dB SNR
  • I2S Compatible Audio Interface
  • Audio Sample Rates up to 192kHz
  • TI’s 3D Enhancement
  • 32-Step Digital Volume Control
  • I2C-Compatible Control Interface
  • Headphone Sense Input
  • Stereo Analog Line Inputs
  • Output Short Circuit Protection
  • Thermal Overload Protection
  • Minimum External Components
  • Click and Pop Suppression
  • Micro-Power Shutdown
  • Available in Space-Saving 32-Pin WQFN Package

Key Specifications

  • SNR at Headphone Output: 102dBA (typ)
  • Speaker Amplifier Efficiency at 3.6V, 650mW/Channel into 8Ω: 87% (typ)
  • Speaker Amplifier Efficiency at 5V, 1.1W/Channel into 8Ω: 80% (typ)
  • Quiescent Power Supply Current Line Inputs:
    • Speaker Mode at LSVDD = 3.6V: 7.5mA (typ)
    • Headphone Mode at HPVDD = 2.5V: 5.3mA (typ)
  • Output Power/Channel Speaker at LSVDD = 5V:
    • RL = 4Ω, THD+N ≤ 10%: 2.5W (typ)
    • RL = 8Ω, THD+N ≤ 1%: 1.25W (typ)
  • Headphone at HPVDD = 2.5V:
    • RL = 16Ω, THD+N ≤ 1%: 34mW (typ)
    • RL = 32Ω, THD+N ≤ 1%: 36mW (typ)
  • PSRR at 1kHz
    • Speaker Mode: 67dB ( typ)
    • Headphone Mode: 77dB (typ)
  • Shutdown current: 0.02μA (typ)

is a trademark of Texas Instruments. All trademarks are the property of their respective owners.

下面可能是您感兴趣的TI公司音频DAC元器件
  • ISO7221A - Dual Digital Isolator
  • TLVH432 - 低电压可调节精密并联稳压器
  • TCA9539 - 具有中断输出、复位和配置功能的远程 16 位 I2C 和 SMBus 低功耗 I/O 扩展器 寄存器
  • REF1925 - 双输出 Vref 和 Vref/2 电压参考
  • LM2717 - 双路降压 DC/DC 转换器
  • DAC108S085 - 具有轨至轨输出的 10 位微功耗八路数模转换器
  • MSP430FR5733 - MSP430FR573x MSP430FR572x 混合信号微控制器
  • SN65HVD21M-EP - 增强型产品扩展共模 Rs-485 收发器
  • TPS79333-EP - 增强型产品超低噪声、高 Psrr、快速射频、200Ma 的低压降线性稳压器
  • CDC203 - 3.3V 6 位反向器/时钟驱动器
  • 节约时间成本,提高采购效率,TI官网授权代理
    TI公司|TI德州仪器|德州仪器TI公司代理商|TI芯片代理商
    TI公司产品现货专家,订购TI公司产品不限最低起订量,TI产品大陆现货即时发货,香港库存3-5天发货,海外库存7-10天发货
    寻找全球TI代理商现货货源 - TI公司(德州仪器)电子元件在线订购